TLR-D42 with OPU-D42


Fan coil unit controller for 3-speed fans and 2 modulating actuators.

The TLR-D42 is a stand-alone electronic single loop controller with a fan control option and one PI heating and cooling sequence. The controller includes 1 NTC room temperature sensor, 3 + 1 relays outputs and two analog outputs. A detailed adaptation to local conditions is possible with the use of a simple configuration routine.

The TLR-D42 can be configured using the standard operation terminal. No special tools or software is required.

The TLR-D42 has been specifically developed to switch larger fans with switching power of up to 10 (6) A.


1 or 3 speed air handler units or fan coils, cooling and/or heating, for 2-pipe or 4-pipe systems with one or two modulating valves; and/or one ON/OFF control (electrical heat, gas heat, hot water spring return valve, etc).

VAV units with heat and cool air supply (auto change-over), fan powered option; local heating coil (electrical, hot water coil, etc.).


  • Temperature control for 2-pipe and 4-pipe fan coil systems.
  • Relays switching up to 10(6)
  • Three binary outputs for fan speeds
  • Two analog output for modulating 0-10 V actuators
  • One binary output for a spring return zone valve, electric heat, gas heat, etc.
  • Automatic fan control for three stage fans.
  • Control for heating, cooling and fan only operation
  • Cost saving option with economy functionality and set point limitation
  • For large rooms: Master – Slave option: One terminal may drive up to 8 base units in parallel.
  • External sensor or open contact for remote control, external heat – cool change or auto-changeover on supply or outdoor temperature with selectable activation limits
  • Password protected programmable user and control parameters
  • Temperature display in Celsius or Fahrenheit

Deluxe version

  • Clock and time schedule functions with special options for schools and universities
  • Clock keeps running for 48h in case of power failure
  • Display with blue backlight
  • Infrared remote controller option: with special features for boost and delayed switching on or off


 Item name  Item code  Power   supply   Description
  TLR-D42-24  40-110085  24 VAC/DC

 Base unit with 1 TI int. or ext.,
 3 DO (relay) fan control,
 1 DO (relay) binary control, 2 AO 0...10 VDC

  TLR-D42-230  40-110086   230 VAC/DC
  OPU-D42  40-100166    Standard operation terminal 2.9x4.4" (73x112 mm)
  OPU-D42-D  40-100167    Deluxe operation terminal 2.9x4.4" (73x112 mm)


OPR1 - Fan Coil Remote Control
Remote control unit for fan coil units of TLC3 and TLR product ranges
Temperature Sensors
Sensing elements or accessories for temperature sensors


Operation Manual

Install Sheet

Application Notes